Emilio Segrè Visual Archives

More than 30,000 photos of scientists and their work

Columbia University F7

Share This

Share/Save

Columbia University F7

How will you use this image ?
Select one of the following options.
Individual Use
Not-for-profit Use
For-profit Use (educational only)
Not sure yet

We charge a usage fee per photo if the photo is published, reproduced in a product or publicly exhibited. This is not a license in the legal sense. As a non-profit institution, we do not make any money providing these photographs. It is only by assessing usage fees that we are able to cover the cost of providing publication quality copies of our photos, preserving the photograph collection according to archival standards, and providing access to the collection by maintaining an online image database. The copyright holder may charge a fee in addition to our service fee.

Images are for use in educational projects only and must be used in a respectful manner.

$20.00
Image title: 
Columbia University cyclotron, showing the new concentric line radiofrequency system
Credit line: 
Research Corporation, courtesy of AIP Emilio Segrè Visual Archives
Description: 

Columbia University cyclotron, showing the new concentric line radiofrequency system. The radiofrequency power is fed from the oscillator to the background through two small concentric lines up the large concentric lines which extend horizontally from the accelerating chamber at the right. The accelerating electrodes within the chamber are supported on the inner conductors of the two large concentric lines which form, in effect, a quarter wavelength line. The low radiofrequency voltages fed to these large lines are 'stepped-up' to very high voltages on the electrodes within the chamber. The concentric lines give marked improvement in efficiency and produce higher voltage at higher radiofrequencies than systems used heretofore. In addition, all equipment is grounded and shielded during operations.

Photo date: 
circa 1938
Original format: 
1 photographic print (black and white; 5 x 3.5 inches)
Person(s): 
Columbia University